Ultrasonic Power Calculation by Linear Regression Method

Abstract

The power that ultrasonic imaging devices apply to the body is adjusted from the interface. it is necessary to verify that the ultrasonic power adjusted from the interface of the device during application is within the safe power range. It is important to verify these devices, which are located in different units in hospitals, without taking a long time because of daily excessive workload. For this purpose, it has been aimed to realize the power verification without causing excessive workload with the ultrasonic power meter device and software developed in our laboratory.The developed device produces a voltage value corresponding to the radiation force generated by the reference masses. Ultrasonic power value is calculated using this voltage value. In order to shorten the verification process, after the verification of certain points instead of the entire measurement region, a curve equation is found with the linear regression method. Ultrasonic power values other than points corresponding to reference masses are verified using this equation. While obtaining the equation, the standard deviation values are calculated according to the results of the measurements and the upper and lower limits are determined in the 2-sigma range by using 2 times the standard deviation. For power measurements made after the equation is obtained, measurement values outside these limits are not included in the calculation. In other words, the reliability of the measurement results is 95%. In the ultrasonic power calculation method presented in this article, it is concluded that the power values obtained by the linear regression method with the reference mass values and the ultrasonic power meter and software accurately estimate the measurement within 5% error limits.